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Chemistry Past Questions and Answers

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Chemistry Questions

Question 61:

Hydrogen diffused through a porous plug

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A Thrice as fast as oxygen
B At the same speed as oxygen
C Four times as fast as oxygen
D Twice as fast as oxygen

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Question 62:

X is a substance which liberates CO<sub style='font-size: smaller;'>2</sub> on treatment with concentrated H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>. A warm solution of X can decolorize acidified KMnO<sub style='font-size: smaller;'>4</sub>. X is

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A HCOOH
B NaH CO<sub style='font-size: smaller;'>3</sub>
C FeCO<sub style='font-size: smaller;'>3</sub>
D H<sub style='font-size: smaller;'>2</sub>C<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>4</sub>

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Question 63:

Zinc Oxide is a

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A Basic Oxide
B Acidic Oxide
C Amphoteric Oxide
D Neutral Oxide
E Reactive Oxide

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Question 64:

Zinc Oxide is a

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A Basic Oxide
B Acidic Oxide
C Amphoteric Oxide
D Neutral Oxide
E Reactive Oxide

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Question 65:

When sodium chloride and metallic sodium are each dissolved in water

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A Both processes are exothermic
B Both processes are endothermic
C The dissolution of metallic sodium is endothermic
D The dissolution of metallic sodium is exothermic
E The dissolution of sodium chloride is explosive

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